Android: keep task's activity stack after restart from HOME

My application has two activities, that I start in this order: ``` HOME > A > B ``` Now I press HOME and launch "A" again. I would like to see activity "B" on a top of "A", but instead I get "A" - so the activity stack is cleared. Manifest: ``` <activity android:name=".activity.A" android:label="A" android:alwaysRetainTaskState="true"> <intent-filter> <action android:name="android.intent.action.MAIN" /> <category android:name="android.intent.category.LAUNCHER" /> </intent-filter> </activity> <activity android:name=".activity.B" android:label="B"> <intent-filter> </intent-filter> </activity> ``` What should I do?